Casio Edifice EFV-640D-3A Green Dial Chronograph Men's Watch

The Casio Edifice EFV-640D-3A is a men's green dial chronograph watch with an octagonal stainless steel bezel and a matching stainless steel bracelet. It suits professionals and active wearers who want one timepiece for the office, travel and outdoor use. The green dial gives it a distinct look without losing a business-ready feel.

Inside the watch, a Japanese quartz movement keeps the hands and chronograph functions running without winding. The 1/10-second stopwatch is handy for timing short tasks, workouts or meetings, and the date window at 3 o'clock shows the day of the month. A mineral glass crystal covers the dial, and luminous hands and markers stay readable in dim light. The case and bracelet are both stainless steel, while the one-touch three-fold clasp opens with a single push. Water resistance is rated to 100 meters (10 Bar).

Key features and benefits of the Casio Edifice EFV-640D-3A

• Green analog chronograph dial: The face is finished in deep green and carries hour, minute and second hands plus chronograph sub-dials. This color stands out from common black or blue dials while still pairing with formal shirts and casual clothes.
• Stainless steel case and bracelet: Both the case and the bracelet are made from solid stainless steel. The metal resists corrosion and everyday wear, so the watch keeps a polished look with normal care.
• Octagonal bezel: An eight-sided bezel frames the dial instead of the usual round shape. The geometric outline gives the watch a sporty, architectural character that you can see at a glance.
• Japanese quartz movement: A battery-powered Japanese quartz movement drives the hands and chronograph. It runs without winding and keeps time to within seconds per month, which suits people who prefer low maintenance.
• 1/10-second chronograph stopwatch: The stopwatch measures elapsed time down to one-tenth of a second. Sub-dials track elapsed minutes and hours up to 12 hours, so you can time laps, intervals or short work tasks.
• Date window: A date display sits at the 3 o'clock position and advances automatically. You can read the day of the month at a glance without pressing a button.
• 100-meter water resistance: The case is sealed to 100 meters, which is 10 Bar. That rating covers swimming, snorkeling and surface water sports, but it is not intended for scuba diving.
• Mineral glass crystal: Hardened mineral glass protects the dial. It resists scratches better than acrylic, though a sharp impact can still chip it, so treat the watch with reasonable care.
• Luminous hands and hour markers: The hands and index markers absorb light and glow in low-light conditions. This helps you read the time in a dim room or at night without a backlight.
• One-touch 3-fold clasp: The bracelet closes with a three-fold clasp that opens by a single push-button. It stays secure during vigorous activity and can be operated one-handed.
• Approximately two-year battery life: The quartz movement runs on a standard button cell for roughly two years. A watch technician can replace the battery and reseat the case seals at the same time.

Who the chronograph watch is for

The Casio Edifice EFV-640D-3A suits men who want one watch to cover work, travel and weekend sport. Its stainless steel build and 100-meter water resistance handle commutes, meetings and pool sessions, while the green dial adds character to both formal and casual outfits. The chronograph is useful for anyone who likes to time short events, and the quartz movement keeps daily use simple.

• Office professionals who want a polished watch that can survive a lunchtime swim.
• Frequent travelers who prefer one timepiece for different climates and activities.
• Weekend athletes timing laps, intervals or hikes with the 1/10-second chronograph.
• Style-conscious wearers who want a green dial that differs from common black or blue faces.

Less suitable if: you need a lightweight titanium or resin case for all-day comfort, or you require ISO-certified dive ratings for scuba use. The 100-meter rating covers swimming and snorkeling, not diving.

Chronograph watch specifications

Using and caring for the Casio Edifice EFV-640D-3A

Rinse the watch with fresh water after it has been in saltwater or a chlorinated pool, because residue can build up around the bracelet links. For regular cleaning, use a soft cloth and mild soapy water on the case and bracelet, then dry the watch thoroughly. Keep the chronograph pushers untouched while the watch is underwater. Store it away from strong magnets, which can affect quartz accuracy, and have the battery changed by a professional so the case seals go back correctly.

• Rinse with fresh water after swimming in a pool or the sea.
• Wipe the mineral glass with a microfiber cloth to reduce fine scratches.
• Press the chronograph pushers only when the watch is dry.
• Keep the watch away from speakers, magnets and devices with strong magnetic fields.
• Ask a qualified watchmaker to replace the battery and check the case seals.

How to choose the right chronograph watch

When you choose a chronograph watch, start with water resistance for the activities you have in mind, then consider bracelet material, movement type and dial legibility. The Casio Edifice EFV-640D-3A is rated to 100 meters (10 Bar) for swimming and snorkeling, and its stainless steel bracelet is built to resist daily wear. A Japanese quartz movement keeps maintenance low because it needs no winding. Luminous hands and markers help in dim light, and the octagonal bezel with green dial gives this model a look that differs from round, single-color chronographs.

Frequently asked questions

What is the case made of?

The case is stainless steel, and the bracelet uses the same metal. Stainless steel resists rust and daily scratches, which helps the watch keep its finish over time.

How water resistant is the Casio Edifice EFV-640D-3A?

It is rated to 100 meters (10 Bar). That makes it suitable for swimming and snorkeling, but not for scuba diving.

Does the chronograph measure fractions of a second?

Yes, the stopwatch reads to 1/10 of a second. The sub-dials also track elapsed minutes and hours up to 12 hours.

How do I set the date?

Pull the crown to the first position and turn it until the correct date shows at 3 o'clock. Avoid changing the date between 9 PM and 1 AM to protect the mechanism.

What battery does the watch use?

A standard silver oxide button cell, typically SR927W or an equivalent, powers the movement for about two years. A watch technician should replace it so the case seals stay correct.

Can the bracelet be resized?

Yes, the stainless steel bracelet has removable links. A jeweler or watch shop can add or remove links for a proper wrist fit.

Will the green dial fade over time?

The dial color is applied under the mineral glass and is stable under normal UV exposure. Very gradual fading may occur only after many years of direct sunlight.

How does this model differ from other Edifice chronographs?

The EFV-640D-3A brings together an octagonal bezel, a green dial and a stainless steel bracelet. Other Edifice models may use round bezels, different dial colors or resin straps.